I am trying to connect to Call of Duty MW3 on Xbox Live. I am using an ethernet cable connected to a router. When I sign into Live and start to search for a game, I am automatically signed out of Xbox Live as soon as the game is found. This also happens when I remove the router and try to connect my Xbox directly to the internet. I've also tried resetting my Xbox, my router, my Xbox and my router at the same time and nothing works. This has only been effecting CoD. Other online games work fine. How can I go about fixing this?